<html>
    <head>
        <title>立方体</title>
        <meta charset="UTF-8"/>
        <link href="./rect.css" rel="stylesheet" type="text/css" />
    </head>
    <body>
        <div id="frame" style="width: 100%; height: 100%; background-color: green">
            <div id="content" style="margin: 0 auto; width: 100%; height: 100%;">
                <canvas id="canvas"></canvas>
            </div>
        </div>
        <script src="./rect.js"></script>
    </body>
</html>